Replacement High Rate battery pack for Wildlife materials tracking receivers. Works inTRX-3s, TRX-16s and TRX-48s . This pack replaces the standard factory pack and gives longer life and additional range. We send an installation procedure with each pack. Check the last picture and make sure the connector on your receiver is the same. We ship via USPS First class mail to the contiguous 48 US states only. We will ship as soon as payment is made. Please feel free to contact us with any questions and or concerns. Thanks